Abstract: Based on ERA-Interim air temperature data and ground observation data of 4 representative stations（Karachi, Jacobabad, Quetta, Drosh） in different climate zones in Pakistan, the characteristics of air temperature change were analyzed by using the methods of linear regression,Mann-Kendall mutation test and Morlet wavelet analysis. The results showed:（1）Pakistan experienced a process of air temperature decreasing at first and then increasing over the last 40 years. Except for the northern mountainous area,the annual mean air temperature increased significantly,and the air temperature increased in all four seasons,especially in spring and autumn. The air temperature mutation occurred around 1998,and the annual mean air temperature experienced the cycles of 4-5,12,20-22 and 32 a.（2） The fitting analysis of ERA-Interim reanalysis data and ground observation data shows that the correlation is extremely significant,and the error is small in most areas except the northern mountainous area. Hence,it could reflect the characteristics of air temperature change in Pakistan.（3）The spatial distribution of annual and seasonal mean air temperature in Pakistan shows distinct zonality. The high air temperature zone was located in the Indus Plain and delta area in the south, while the low air temperature area is located in the northern mountainous area. The annual, spring and autumn mean air temperature variation shows an obvious increasing trend in space.